I need to replace part of an end joist. The joist sits (parallel) on a 2x4 cripple wall. How should the joint between old and new joist be handled?
As far as I can tell, California Residential Code chapter 5 just requires that the joist ends bear 1.5" minimum on wood support (R502.6), and that joists "framing from opposite sides over a bearing support shall lap not less than 3" and shall be nailed together with a minimum three 10d face nails" (R502.6.1).
The bearing part is easy--I can add a pair of 2x4 studs, or a 4x4 if required, to the cripple wall. But the 2 joist sections can't lap if they are in the original positions. I could easily add a 2nd sister joist next to the joint, and this sister could be as long as needed.
How would you handle this? Any input is appreciated!